The reject mechanism in metal detector serves to separate metal-containing particles from
the corresponding mixture that conveyed through the system. The system enables automatic
removal of contaminated mixture without the need for human intervention, which is highly
sought after and almost indispensable solution in modern industry. The reject mechanism is
primarily consisted of housing, flap, bearings, and flap actuation system. This thesis presents
the manufacturing process of rejection mechanism. The first part focuses on the conceptual
design and material selection, the second part presents the method of the manure flap
controlling. First we selected some possible materials for the housing and then evaluated
some the most appropriate materials for our application. We also selected a few options for
the flap actuation analysed them and chose two the most suitable ones. Economic analysis
was performed for the selected housing materials and actuation systems, which was
presented using tables and graphical representation. Finally the proposed designing concepts
were closely examined and compared to identify the most cost effective and technically
optimal solution. The thesis concludes with recommendations for further development and
potential improvements of the reject mechanism.
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